US8562653B2 - Surgical tether apparatus and methods of use - Google Patents
Surgical tether apparatus and methods of use Download PDFInfo
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- US8562653B2 US8562653B2 US12/721,198 US72119810A US8562653B2 US 8562653 B2 US8562653 B2 US 8562653B2 US 72119810 A US72119810 A US 72119810A US 8562653 B2 US8562653 B2 US 8562653B2
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
- A61B17/7062—Devices acting on, attached to, or simulating the effect of, vertebral processes, vertebral facets or ribs ; Tools for such devices
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
- A61B17/7062—Devices acting on, attached to, or simulating the effect of, vertebral processes, vertebral facets or ribs ; Tools for such devices
- A61B17/7067—Devices bearing against one or more spinous processes and also attached to another part of the spine; Tools therefor
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
- A61B17/7097—Stabilisers comprising fluid filler in an implant, e.g. balloon; devices for inserting or filling such implants
Definitions
- the present invention generally relates to medical methods and apparatus. More particularly, the present invention relates to methods and apparatus used to restrict flexion of a spinal segment.
- the methods and apparatus disclosed herein may be used alone or in combination with other orthopedic procedures such as those intended to treat patients with spinal disorders.
- Exemplary spinal disorders include but are not limited to back pain as well as joint problems, vertebral fractures, intervertebral disc, nucleus and annulus problems.
- a major source of chronic low back pain is discogenic pain, also known as internal disc disruption.
- Discogenic pain can be quite disabling, and for some patients, can dramatically affect their ability to work and otherwise enjoy their lives.
- Patients suffering from discogenic pain tend to be young, otherwise healthy individuals who present with pain localized to the back.
- Discogenic pain usually occurs at the discs located at the L 4 -L 5 or L 5 -S 1 junctions of the spine. Pain tends to be exacerbated when patients put their lumbar spines into flexion (i.e. by sitting or bending forward) and relieved when they put their lumbar spines into extension (i.e. by standing or arching backwards).
- Flexion and extension are known to change the mechanical loading pattern of a lumbar segment.
- the segment When the segment is in extension, the axial loads borne by the segment are shared by the disc and facet joints (approximately 30% of the load is borne by the facet joints).
- the segmental load In flexion, the segmental load is borne almost entirely by the disc.
- the nucleus shifts posteriorly, changing the loads on the posterior portion of the annulus (which is innervated), likely causing its fibers to be subject to tension and shear forces. Segmental flexion, then, increases both the loads borne by the disc and causes them to be borne in a more painful way. It would therefore be desirable to provide methods and apparatus that reduce or modulate loading on the disc and adjacent tissue.
- Patents and published applications of interest include: U.S. Pat. Nos. 3,648,691; 4,643,178; 4,743,260; 4,966,600; 5,011,494; 5,092,866; 5,116,340; 5,180,393; 5,282,863; 5,395,374; 5,415,658; 5,415,661; 5,449,361; 5,456,722; 5,462,542; 5,496,318; 5,540,698; 5,562,737; 5,609,634; 5,628,756; 5,645,599; 5,725,582; 5,902,305; Re.
- the present invention generally relates to medical methods and apparatus. More particularly, the present invention relates to methods and apparatus used to restrict flexion of a spinal segment.
- the methods and apparatus disclosed herein may be used alone or in combination with other orthopedic procedures such as those intended to treat patients with spinal disorders.
- Exemplary spinal disorders include but are not limited to back pain as well as joint problems, vertebral fractures, intervertebral disc, annulus and nucleus problems.
- a surgical method comprises implanting a first prosthesis into the patient where the first prosthesis is engaged with at least a portion of a spinal segment in the patient.
- the method also includes the step of implanting a constraint device into the patient, with the constraint device having an upper tether portion, a lower tether portion and a compliance member coupled therebetween.
- An upper portion of the constraint device is engaged with a superior spinous process and a lower portion of the constraint device is engaged with an inferior spinous process or a sacrum.
- the length or tension in the constraint device is adjusted so that the construct of the tethers and compliance member provides a force resistant to flexion of the spinal segment.
- the length or tension may be adjusted to a desired value.
- the constraint device modulates loads borne by the first prosthesis or tissue adjacent thereto. The constraint device may indirectly modulate these loads.
- the first prosthesis may comprise bone graft.
- a spinal treatment system comprises a constraint device having an upper tether portion, a lower tether portion and a compliance member coupled therebetween.
- the upper tether portion is coupled with a superior spinous process of a spinal segment in a patient and the lower tether portion is coupled with an inferior spinous process or sacrum of the spinal segment.
- Length or tension in the constraint device is adjustable so that the construct of the compliance member and tethers provides a force resistant to flexion of the spinal segment.
- the system also includes a first prosthesis coupled with the spinal segment, wherein the constraint device modulates loads borne by the prosthesis or by tissue adjacent thereto.
- a spinal treatment system comprises a first prosthesis comprising a plurality of pedicle screws and at least one spinal stabilization rod.
- the first prosthesis is adapted to instrument a pair of vertebrae to be fused.
- the pair of vertebrae is disposed in a spinal segment of a patient, and at least one pedicle screw is threadably engaged with at least one each of the vertebrae to be fused.
- the stabilization rod is coupled with the at least one pedicle screw and also the stabilization rod is disposed across the pair of vertebrae to be fused.
- a constraint device comprises a compliance member, with the constraint device being superior to at least a portion of the pair of vertebrae to be fused.
- a lower portion of the constraint device is operatively coupled with at least one of the pedicle screws, and the constraint device length or tension is adjustable to so as to provide a force resistant to flexion of the spinal segment superior to the vertebrae to be fused.
- a lower portion of the constraint device may be operatively coupled directly with one of the fused vertebra, such as by encircling the spinous process of the fused vertebra.
- the constraint device length or tension may be adjusted to a desired value.
- the constraint device also modulates loads borne by the first prosthesis and tissue adjacent thereto.
- the constraint device may comprise an upper tether portion that is disposed at least partially around a superior spinous process or an upper portion of the compliance member may be operatively coupled with a pedicle screw that is threadably engaged with a pedicle superior to the instrumented region of the spinal segment.
- the embodiment described above may be inverted so that the constraint device may be inferior to at least a portion of the pair of vertebrae to be fused.
- the first prosthesis may comprise an artificial disc that is implanted between adjacent vertebrae.
- the disc may be implanted from a posterior, anterior, lateral, or other approach and the adjacent tissue may comprise an intervertebral disc, vertebral body, endplate or facet joints which may be adjacent the artificial disc.
- the first prosthesis may comprise an artificial facet joint.
- At least one of the first prosthesis or the constraint device may comprise a therapeutic agent that is adapted to modify tissue in the spinal segment.
- the therapeutic agent may comprise a bone morphogenetic protein or one of its precursors, or another agent whose effect is to modify the load-bearing characteristics of the spinal segment.
- the method may further comprise the steps of fusing two adjacent vertebrae together with bone grafting material and implanting the first prosthesis may comprise coupling a substantially inelastic tether to the superior vertebra of the two vertebrae that are fused or will be fused together, wherein the construct of the substantially inelastic tether and lower tether portion limits flexion between the two vertebra that are fused or that will be fused together.
- the construct of the constraint device also provides a force that is resistant to flexion of the supradjacent or the subjacent motion segment or pair of vertebrae.
- the substantially inelastic tether also may be disposed between the upper and lower tether portions.
- the substantially inelastic tether may be disposed at least partially around a superior surface of an intermediate spinous process.
- the inelastic tether may also be disposed through a notch or hole in intermediate spinous process. Additional disclosure on notching or creating an aperture in a spinous process is disclosed in U.S. Provisional Patent Application No. 61/149,224 filed Feb. 2, 2009, and International PCT Application No. PCT/US2010/022767, the entire contents of which are incorporated herein by reference.
- the intermediate spinous process may be disposed between the superior spinous process and the inferior spinous process or the sacrum.
- implanting the first prosthesis comprises positioning a spacer between a pair of adjacent spinous processes.
- the pair of adjacent spinous processes between which the spacer is implanted may be disposed superior to at least one of the superior spinous process, the inferior spinous process, or the sacrum, and the spacer may inhibit extension of at least a portion of the spinal segment at which it is implanted.
- the force provided by the construct of the compliance member and tethers may resist flexion of a portion of the spinal segment inferior to the spacer.
- implanting the first prosthesis may comprise positioning a spacer between a pair of adjacent spinous processes that are disposed inferior to at least one of the superior spinous process, or the inferior spinous process.
- the spacer inhibits extension of at least a portion of the spinal segment at which it is implanted and the force provided by the construct of the compliance member and tethers may resist flexion of a spinal segment that is superior to the spacer.
- Implanting the first prosthesis may comprise inserting a prosthetic nucleus into a disc disposed between adjacent vertebrae. During segmental flexion, wedging of the vertebral endplates may force the prosthetic nucleus dorsally. Adjusting length or tension in the constraint device may inhibit migration or expulsion of the prosthetic nucleus away from the center of the disc. The tension of the constraint device may be modified or re-adjusted either transcutaneously or in a second surgical procedure. This allows the constraint device to initially be adjusted to a higher tension during an initial period of time after nucleus implantation when greater segmental stiffness is desirable. The higher initial stiffness facilitates soft tissue healing and also minimizes the risk of early nucleus migration from the disc.
- tension may be re-adjusted to a desired value, such as to a lower value in order to decrease segmental stiffness.
- the method may further comprise fully removing a disc or partially removing disc material between adjacent vertebrae of the spinal segment.
- the constraint device may modulate loading on the disc space, a prosthetic nucleus placed, or region and any remaining disc material.
- the constraint device may inhibit re-herniation of the disc after discectomy.
- the first prosthesis may comprise an annular repair device that is configured to repair or compensate for an injury or defect in an annulus fibrosus of the spinal segment. Implanting the first prosthesis may comprise implanting the annular repair device from a posterior approach.
- the constraint device may inhibit migration or expulsion of the annular repair device from the annulus fibrosus.
- Implanting the first prosthesis may comprise injecting a filler material such as bone cement into a vertebra.
- Implanting the first prosthesis may comprise treating a fractured vertebra with kyphoplasty or vertebroplasty.
- the constraint device may modulate loading on the vertebra.
- the step of implanting the constraint device may comprise piercing an interspinous ligament to form a penetration superior to superior surface of the superior spinous process and advancing the upper tether portion through the penetration.
- the step of implanting the constraint device may also comprise piercing an interspinous ligament to form a penetration inferior to an inferior surface of the inferior spinous process and advancing the lower tether portion through the penetration.
- the constraint device may be advanced through a notch or aperture in either of the superior or inferior spinous processes, as disclosed in U.S. Provisional Patent Application No. 61/149,224, and International PCT Application No. PCT/US2010/022767 previously incorporated herein by reference.
- the constraint device may be advanced through a gap between the superior spinous process and an adjacent spinous process, or a gap between the inferior spinous process and an adjacent spinous process.
- the gap may be created by surgical removal of an interspinous ligament therefrom during a decompression or other procedure.
- Adjusting length or tension in the constraint device may comprise adjusting the length or tension a plurality of times during treatment of the spinal segment and during or after healing of the spinal segment. Adjusting length or tension may further comprise transcutaneous adjustment after the initial implantation procedure is completed.
- the region extending directly between an inferior surface of the superior spinous process and a superior surface of the inferior spinous process may remain free of prostheses.
- the method may further comprise fusing a pair of adjacent vertebrae of a spinal segment in a patient. Fusing the pair of adjacent vertebrae may further comprise instrumenting the pair of adjacent vertebrae with a plurality of pedicle screws and at least one stabilization rod disposed therebetween.
- the method may also comprise implanting a constraint device into the patient, the constraint device engaging a vertebra adjacent to the fused pair of vertebrae, typically immediately superior to but potentially immediately inferior to the fused pair of vertebrae.
- the constraint device may comprise a compliance member with a portion of the constraint device operatively coupled with a pedicle screw system or coupled directly to one of the fused vertebrae.
- the method also may include the step of adjusting length or tension in the constraint device, thereby providing a force resistant to flexion of the spinal segment and modulating loads borne by the instrumented adjacent vertebrae and tissue adjacent thereto.
- the length or tension may be adjusted to a desired a value.
- the constraint device may comprise an upper tether portion that is disposed at least partially around or through a superior spinous process.
- an upper portion of the compliance member may be operatively coupled with a fastener that is coupled with a pedicle superior to the instrumented region of the spinal segment.
- the fastener may comprise a pedicle screw.
- the constraint device may also be attached to the inferior adjacent segment.
- the constraint device may comprise a lower tether portion that is disposed at least partially around or through an inferior spinous process or sacrum.
- the lower portion of the compliance member may be operatively coupled with a fastener such as a pedicle screw, that is coupled with a pedicle inferior to the instrumented region of the spinal segment or directly coupled to the spinal segment, inferior of the fused vertebrae.
- a fastener such as a pedicle screw
- FIG. 1A is a schematic diagram illustrating the lumbar region of the spine.
- FIG. 1B a schematic illustration showing a portion of the lumbar region of the spine taken along a sagittal plane.
- FIG. 2 illustrates a spinal implant of the type described in U.S. Patent Publication No. 2005/0216017A1.
- FIGS. 3A-3B illustrate the use of a constraint device with an artificial disc and/or an artificial facet joint.
- FIGS. 4A-4C illustrate the use of a constraint device supradjacent to a spinal fusion.
- FIG. 5 illustrates the use of a constraint device with an interspinous spacer.
- FIGS. 6A-6B illustrate the use of a constraint device with an artificial nucleus.
- FIGS. 7A-7D illustrate the use of a constraint device in addition to kyphoplasty.
- FIGS. 8A-8B illustrate the use of a constraint device with an annular repair device.
- FIG. 1A is a schematic diagram illustrating the lumbar region of the spine including the spinous processes (SP), facet joints (FJ), lamina (L), transverse processes (TP), and sacrum (S).
- FIG. 1B is a schematic illustration showing a portion of the lumbar region of the spine taken along a sagittal plane and is useful for defining the terms “neutral position,” “flexion,” and “extension” that are often used in this disclosure.
- neutral position refers to the position in which the patient's spine rests in a relaxed standing position.
- the “neutral position” will vary from patient to patient. Usually, such a neutral position will be characterized by a slight curvature or lordosis of the lumbar spine where the spine has a slight anterior convexity and slight posterior concavity.
- the presence of the constraint of the present invention may modify the neutral position, e.g. the device may apply an initial force which defines a “new” neutral position having some extension of the untreated spine.
- neutral position of the spinal segment refers to the position of a spinal segment when the spine is in the neutral position.
- flexion refers to the motion between adjacent vertebrae of a spinal segment as the patient bends forward.
- the distance between individual vertebrae L on the anterior side decreases so that the anterior portion of the intervertebral disks D are compressed.
- the individual spinous processes SP on the posterior side move apart in the direction indicated by arrow B. Flexion thus refers to the relative movement between adjacent vertebrae as the patient bends forward from the neutral position illustrated in FIG. 1B .
- extension refers to the motion of the individual vertebrae L as the patient bends backward and the spine extends from the neutral position illustrated in FIG. 1B . As the patient bends backward, the anterior ends of the individual vertebrae will move apart. The individual spinous processes SP on adjacent vertebrae will move closer together in a direction opposite to that indicated by arrow B.
- Back pain may be caused by a number of conditions associated with the spinal segment, and many different types of spinal interventions and prostheses have been developed to address such conditions.
- treatments administered in an effort to alleviate back pain and related problems include replacement or modification of a disc or disc nucleus, repair of an annulus fibrosus, repair of vertebral fractures with kyphoplasty or vertebroplasty, facet joint replacement, and spinal fusion.
- spinal prostheses or surgical procedures may adversely modify loading in the spinal column, causing excessive or otherwise detrimental loads to be borne by the prostheses or by treated or adjacent tissue.
- Such loads may result in loosening, migration or expulsion of a prosthesis, a significant risk for a prosthetic disc, facet, nucleus, or annular repair device, and a risk also for traditional fusion hardware.
- loads may injure a treated site while it is still healing and vulnerable to mechanical damage and result in iatrogenically damaged tissue; this is particularly true for kyphoplasty.
- loads may lead to degeneration of tissue adjoining a treatment site, as has been observed for segments adjacent to a spinal fusion.
- such loads may result in increased wear and tear on prostheses, decreasing such prostheses' useful lifetimes and potentially leading to device failures.
- Spinal stabilization is typically accomplished with instrumentation such as pedicle screws and stabilization rods. Placement of such traditional instrumentation in many cases requires major surgery with significant operative morbidities and a long healing period, can be painful, may limit patient mobility, and can result in undesirable wear and tear on the instrumentation itself as well as on adjacent bone and other tissue.
- the present approach disclosed herein utilizes indirect unloading and indirect stabilization of the affected spinal segment by constraining flexion, preferentially biasing the motion of the spinal segment into extension where it is inherently more stable.
- the spinal segment is biased into this position using an adjustable constraint device that provides a variable force resistant to flexion.
- Using an indirect approach to augment stability of the spine provides a unique way to improve the mechanical loading environment for implanted spinal devices, surgically treated tissue, and adjacent tissue.
- Another major advantage of using the present devices and methods is that no loading other than tensile loading is transferred to the constraint device, and thus the constraint device is likely to experience fewer failure modes than traditional instrumentation in which significant, complex loading is transferred to the screws and rods.
- the present constraint device therefore, not only attempts to maximize therapeutic effectiveness, but also attempts to minimize failure, while most existing spinal instrumentation maximizes load-bearing and consequentially has a high rate of mechanical failure.
- the spinal segment when traditional instrumentation such as pedicle screws and rods is used, the spinal segment, once instrumented, is locked into a given position. Even with dynamic stabilization rods, only limited motion is permitted. A rod-and-screw approach thus relies on the skill of the surgeon to determine the optimal position of the spinal segment prior to instrumenting it.
- the present devices and methods are advantageous because they do not “lock” the spinal segment into a rigid position.
- the present devices and methods are adjustable in situ and allow some movement of the spinal segment after implantation, reducing the need to establish a single optimal position before the implantation occurs. If this adjustability contributes to more consistent fit between the device and surrounding tissues, healing around the device and in surrounding tissue may occur in a more natural manner.
- the present devices may also be adjusted in later procedures after initial implantation and are thus likely to be better at accommodating changes over time compared to rigid instrumentation systems.
- the present device is not rigid and can accommodate these types of motions and therefore is less likely to fail in service. Because of its potentially lower failure rate, the present device should generate fewer safety concerns and a lower complication rate.
- the present devices and methods also preserve more natural motion of the spinal segment and have unique kinematic signatures compared with other rigid or “flexible” instrumentation devices. Unlike pedicle screw and rod instrumentation, the present devices and methods tend to encourage engagement of the facets. This results in some indirect restriction of axial rotation, which may provide additional spinal segment stability.
- the present device disclosed herein intentionally allows backward motion (extension) which helps avoid issues with extension loading and may help with balancing of the patient's vertebral column. Most other instrumentation devices or systems do not permit backward motion of the spinal segment.
- FIG. 2 shows a spinal implant of the type described in related U.S. Patent Publication No. 2005/02161017 A1, now U.S. Pat. No. 7,458,981 the entire contents of which are incorporated herein by reference.
- the constraint device of FIG. 2 may be used alone or in combination with other spinal treatments to modulate loads borne by prostheses implanted into the patient or borne by tissue adjacent the treatment area and to thereby facilitate healing and reduce wear and tear.
- the constraint device may be used to provide greater stability to the spinal segment.
- adjunctive stabilization may be implanted concurrently with the primary prosthesis or procedure; or may be implanted at a later date to address degenerative changes associated with the detrimental loading of the primary prosthesis or adjacent tissue.
- a limited number of implants are known that combine motion-preservation approaches to address multiple pathologies simultaneously; for example, the PDS by Disc Motion Technologies, is a combination of facet replacement device and total disc replacement prosthesis.
- such combination devices are intended to address two independent primary pathologies occurring in combination—for example, the combined disc replacement and facet replacement device addresses combined pathology of the facet joint and the disc. It would be advantageous to provide a means with which improve the results of a primary treatment by augmenting and modulating the biomechanics of the primary treatment.
- adjunctive therapy or constraint it would further be advantageous for the adjunctive therapy or constraint to be minimally invasive, to avoid the use of pedicle screws due to the known associated complications and morbidities, and to allow for physiologic loading and motion in concert with the intention of the primary motion-preservation treatment.
- an implant 10 typically comprises a tether structure having an upper strap component 12 and a lower strap component 14 joined by a pair of compliance members 16 .
- the upper strap 12 is shown disposed over the top of the spinous process SP 4 of L 4 while the lower strap 14 is shown extending over the bottom of the spinous process SP 5 of L 5 .
- the compliance member 16 will typically include an internal element, such as a spring or rubber block, which is attached to the straps 12 and 14 in such a way that the straps may be “elastically” or “compliantly” pulled apart as the spinous processes SP 4 and SP 5 move apart during flexion. In this way, the implant provides an elastic tension on the spinous processes which is a force that resists flexion.
- the force increases as the processes move further apart.
- the straps themselves will be essentially non-compliant so that the degree of elasticity or compliance may be controlled and provided solely by the compliance members 16 .
- the implant 10 may be coupled to the spinal segment in a minimally invasive manner. Typically, a small puncture is created in the interspinous ligament (not illustrated) superior to the superior spinous process and also inferior to the inferior spinous process. The upper and lower straps may then be advanced through these piercings and the ends coupled together to form a closed loop. Additional details on implant 10 and the methods of use are disclosed in U.S. Provisional Patent Application Nos. 61/093,922; 61/059,543; 61/059,538; U.S. patent application Ser.
- FIGS. 3A-3B illustrate the use of a constraint device with an artificial disc or artificial facet joint replacement device.
- a natural intervertebral disc D is normally disposed between two adjacent vertebrae V.
- the damaged disc may be replaced with an artificial disc 302 .
- Artificial discs are well known in the art and exemplary commercial devices include the Charotti artificial disc from Depuy Spine, a Johnson & Johnson Company, as well as other devices from Synthes and Medtronic Sofamor Danek.
- the artificial disc 302 replaces the natural disc D and restores proper alignment and spacing between the two vertebrae V and allows smooth relative motion between the two vertebrae V.
- FIG. 3B illustrates the implantation of an artificial replacement facet joint 306 which may be used alone or in combination with the artificial disc implant.
- Facet joint replacements are also well known in the art such as the Acadia provided by Facet Solutions, Inc.
- facet joints are repaired or replaced with a joint prosthesis in order to eliminate the pathological, painful joint; restore normal motion and provide stabilization of the spinal segment.
- facet joint implants may be used as an adjunct to partial laminectomy, laminotomy, neural decompression and facetectomy, in lieu of fusion.
- Facet joint implants are often used to treat instabilities or deformities of the lumbar spine including degenerative disease of the facets, degenerative disease of the facets with instability, degenerative spondylolisthesis and spinal stenosis.
- Constraint device 304 generally takes the same form as the constraint device illustrated in FIG. 2 and includes an upper tether portion, a lower tether portion and a pair of compliance members (only one illustrated in the lateral view of FIG. 3 ). The upper tether portion is disposed around a superior surface of a superior spinous process and the lower tether portion is disposed around an inferior surface of an inferior spinous process.
- the method for applying the constraint device is disclosed in greater detail in U.S. Patent Publication No. 2008/0262549 and additional disclosure on the constraint device may be found in U.S. patent application Ser. No. 12/106,103 and U.S. Pat. No. 7,458,981; all previously incorporated herein by reference.
- the methods for implanting the constraint device may be applied to any of the embodiments disclosed herein and any of the constraint devices disclosed herein may take the form of constraint device 304 .
- some of the loading applied to the artificial disc or artificial facet joint and adjacent tissue is modulated. For the disc, this change in loading may minimize disc edge impingement, reducing the need for more complex artificial discs with features that limit edge impingement.
- the loading is more evenly distributed or even lessened.
- applying a constraint device helps restore more natural biomechanics in the spinal segment.
- FIGS. 4A-4C illustrate how the constraint device of FIG. 2 may be used in conjunction with fusion of a spinal segment.
- adjacent vertebrae are fused together using methods well known in the art.
- the fused region F is often instrumented with pedicle screws 402 and spinal stabilization rods 404 to prevent motion at the level of the fusion, although in situ fusions may be performed without internal fixation. While this procedure is promising, it may also have potential drawbacks. For example, after spinal fusion is attained, excessive motion may result at adjacent levels (e.g. spinal segment regions above and below the fused region F). This is due to compensation for loss of flexibility at the fused segment and can result in further degeneration of the motion segments.
- a constraint device 406 such as the one illustrated in FIG. 2 is applied to the motion segment superior to the fused region.
- the constraint device is secured to the spinal segment such that it is completely independent of the fusion instrumentation.
- the constraint device is disposed around the superior surface of a superior spinous process superior to the fusion and also around an inferior surface of an inferior spinous process, the inferior spinous process being a part of superior region of the fused spinal segment.
- motion along the instrumented region is substantially inhibited in order to facilitate the fusion process and the constraint device restricts flexion of the spinal segment supradjacent to the fused region.
- This helps more evenly distribute and possibly lessen loading applied to the fusion instrumentation as well as adjacent tissue, particularly the adjacent intervertebral disc. It also reduces excessive motion and lessens the chance of further degeneration of the non-fused motion segments.
- FIG. 4B illustrates an embodiment similar to that of FIG. 4A with the major difference being that in FIG. 4B , the constraint device is coupled with the fusion instrumentation.
- the lower vertebra is fused with another vertebra (not illustrated).
- the fused region F is then instrumented with pedicle screws 402 and spinal stabilization rods 404 to prevent motion between the fused vertebrae.
- a constraint device 408 is then applied supradjacent to the fused segment.
- the constraint device 408 includes an upper tether 410 disposed around a superior surface of a superior spinous process and a pair of compliance members 412 which provide the force resistant to flexion of the spinal segment.
- each compliance member 412 is anchored with the pedicle screw 402 and stabilization rod 404 .
- the constraint device 408 limits flexion of the spinal segment supradjacent to the fused region F.
- the upper portion of the compliance member 412 may include a coupling bar 416 illustrated in phantom that is coupled with a pedicle screw or other fastener 414 instead of using the upper tether 410 .
- the constraint could be turned around such that the constraint device is inferior to the fused region and a top portion of the compliance members are coupled with a pedicle screw.
- FIG. 4C illustrates lateral and posterior views of an alternative embodiment of a constraint device similar to that of FIG. 2 that may be modified to provide resistance to flexion as well as prevent motion of a fused spinal segment.
- a posterolateral fusion F is performed between adjacent vertebrae, here L 4 and L 5 .
- a constraint device 420 includes an upper tether portion 422 and a lower tether portion 426 .
- the constraint device 420 is coupled with the spinal segment such that the upper tether portion 422 is disposed around the superior surface of a superior spinous process of a vertebrae adjacent the fused region and the lower tether portion 426 is disposed around an inferior surface of an inferior spinous process on the inferior portion of the fused region.
- An intermediate tether 424 is disposed around the superior surface of an intermediate spinous process and the ends of the intermediate tether 424 are secured to the lower tether portion 424 .
- the intermediate spinous process is disposed between the superior and inferior spinous processes to which the constraint device is coupled, and in this exemplary embodiment, the intermediate spinous process is a part of the upper fused vertebra.
- the upper, lower and intermediate tether portions 422 , 424 , 426 are substantially inelastic, thus motion between the inferior spinous process and the intermediate spinous process is controlled based on the tension or length in the tether portions 424 , 426 .
- the construct of the upper tether portion 422 , the lower tether portion 426 and compliance member 408 restrains flexion of the supradjacent segment.
- the constraint device could also be used such that flexion of the spinal segment inferior to the fused region is restricted.
- no implant is placed in between the constraint device.
- a constraint device is coupled with a superior surface of a superior spinous process and an inferior surface of an inferior spinous process
- the region extending directly between an inferior surface of the superior spinous process and a superior surface of the inferior spinous process often remains free of any spacers or other implants.
- an interspinous spacer is used in combination with a constraint device to limit extension and flexion of spinal segments.
- a spacer 502 such as the X Stop provided by St. Francis Medical Technologies, Inc. (acquired by Kyphon, Inc., now a part of Medtronic) is positioned between spinous processes SP on L 3 and L 4 .
- the spacer limits extension between adjacent vertebra thereby potentially reducing facet loading and increasing the area of the spinal canal and foramen. This helps relieve patients' systems such as neurogenic claudication and pain.
- a constraint device 504 may also be applied to the spinal segment in order to limit flexion. In FIG.
- constraint device 504 includes an upper tether portion 506 , compliance members 508 and a lower tether portion 510 .
- the upper tether portion in this embodiment is shown directly coupled with the spacer 502 . It may be attached to the spacer with a number of methods including bonding, welding, fixturing, passing it through an aperture, etc.
- the upper tether portion need not be coupled with the spacer. Instead, the tether may be disposed around a superior surface of a superior spinous process similar to the embodiments of FIGS. 2 , 3 , and 4 A- 4 C previously discussed.
- the lower tether portion 510 is disposed around an inferior surface of an inferior spinous process.
- flexion is limited in the segment inferior to the spacer and the construct of the tethers and compliance members 508 provide a force resistant to flexion.
- the spacer may be disposed between any two spinous processes along the spinal segment, thus constraint device position may be moved along the spinal segment as required.
- An artificial or prosthetic nucleus may be used instead of a total disc prosthesis when disc degeneration is at an early or intermediate stage and the disc annulus is still competent and provides adequate constraint. By replacing only the nucleus, remaining disc tissues such as the annulus and endplates are preserved along with their functions. The surgical procedure for replacing the nucleus may be simpler than a total disc replacement.
- an artificial nucleus 602 is implanted into the remaining disc annulus A that is disposed between vertebrae V.
- the prosthetic nucleus 602 re-inflates the annulus and relieves compressive loads by carrying a portion of the load.
- the nucleus 602 may experience undesired migration, expulsion, wear or other negative effects due to segmental flexion.
- constraint device 604 is applied to the upper and lower spinous processes of the vertebrae surrounding the artificial nucleus 602 .
- the constraint device 604 generally takes the same form as the constraint devices previously described.
- constraint device 604 includes an upper tether portion 606 , a lower tether portion 610 and a pair of compliance members 608 (only one shown in the lateral view of FIG. 6B ).
- the upper tether portion 606 is disposed around a superior surface of a superior spinous process and the lower tether portion 610 is disposed around an inferior surface of an inferior spinous process.
- Constraint device 604 resists flexion of the spinal segment surrounding the artificial nucleus, thus distributing forces more evenly on the artificial nucleus and surrounding tissue, thereby preventing damage to and expulsion of the nucleus.
- FIGS. 7A-7D illustrate the use of a constraint device in conjunction with kyphoplasty.
- kyphoplasty may be an appropriate minimally invasive treatment.
- FIG. 7A illustrates a spinal fracture 702 in a vertebra V.
- FIG. 7B illustrates the main steps in a kyphoplasty procedure.
- a hollow instrument is used to create a narrow pathway into the fractured bone 702 .
- An orthopedic balloon 704 is then inserted through the pathway into the fractured vertebral body 702 .
- FIG. 7B is a lateral view and therefore only illustrates one balloon.
- the balloons 704 are then inflated in order to raise the collapsed vertebral body and return it to its normal position. Inflating the balloons also creates a cavity in the bone and once the balloons are deflated, the cavity is filled with bone cement 706 or a bone cement analogue, thereby forming an internal cast that holds the vertebral body in position. Again, this is a promising treatment, but flexion bending motions as indicated by the arrow in FIG. 7C may exert higher compressive loads on the anterior portion of the repaired vertebra.
- the stiffness of the repaired vertebral body may be greater than that of the native vertebral body because the elastic modulus of bone cement and most bone cement substitutes is greater than that of the normal bone; as such, there could be excessive wear and tear at the bone cement-bone interface.
- Application of a constraint device that limits flexion may help offload the repaired fracture and adjacent tissues 708 thereby reducing these adverse complications.
- FIG. 7D a constraint device similar to that of FIG. 2 is applied to the spinal segment treated with kyphoplasty.
- the constraint device 710 generally takes the same form as previously described above.
- the constraint device 710 includes an upper and lower tether portion 712 , 716 that are disposed around the spinous processes adjacent the spinal fracture.
- the upper tether portion 712 is disposed around a superior surface of a superior spinous process and the lower tether portion 716 is disposed around an inferior portion of an inferior spinous process of the fractured vertebra.
- the construct of the tethers and a pair of compliance members 714 (only one illustrated in the lateral view of FIG. 7D ) provide the force resistant to flexion of the treated spinal segment.
- Other embodiments may include variations on kyphoplasty including but not limited to vertebroplasty (injection of a filler material without expansion of the kyphoplasty balloon) and implants (e.g. implantation of stent-like or mesh-like devices).
- FIGS. 8A-8B illustrate the use of a constraint device with an annular repair device.
- Annular repair devices are used to patch or repair a defect, lesion, tear or other injury in the annulus fibrosus, especially one due to a disc herniation.
- FIG. 8A illustrates an annular defect 804 in an intervertebral disc between adjacent vertebrae V.
- An annular repair device 802 is coupled with the annulus in order to prevent disc herniation or nucleus expulsion.
- Herniations are often acutely associated with flexion, indicated in FIG. 8A by the arrows, which may also inhibit healing and induce re-herniation.
- flexion motions may place more demands on annular repair devices, thus impacting their effectiveness.
- a constraint device that restricts flexion motions may help reduce the incidence of re-herniation and improve outcomes for patients treated with an annular repair device, in particular a minimally invasive device.
- FIG. 8B illustrates the use of a constraint device such as the one seen in FIG. 2 in conjunction with the annular repair device 802 .
- the constraint device generally takes the same form as those previously described above.
- Constraint device 806 includes upper and lower tether portions 808 , 812 and a pair of compliance members 810 (only one seen in the lateral view of FIG. 8B ).
- the upper tether portion is disposed around a superior surface of a superior spinous process and the lower tether portion is disposed around an inferior surface of an inferior spinous process.
- the construct of the tethers and compliance members 810 provide a force that limits flexion of the spinal segment. This also helps to reduce tension in the posterior annulus and keeps the annular defect 804 closed.
- tension and or length of the constraint device may be adjusted in order to control how much resistance to flexion is provided.
- the constraint devices may be adjusted before, during or after implantation including transcutaneously so that additional surgery is avoided. This also allows the device to be adjusted as healing occurs. For example, a tighter constraint device that provides greater resistance to flexion may be provided during the initial phase of healing and a less tight constraint device that provides less resistance to flexion may be required as healing progresses.
- Various adjustment and locking mechanisms are disclosed in U.S. Provisional Patent Application Nos. 61/059,543; and 61/059,538; previously incorporated herein by reference, as well as other patent applications incorporated herein.
- any of the embodiments disclosed herein may also be used to carry and deliver a therapeutic agent that facilitates the healing process.
- antibiotics may be carried by the constraint device to help prevent infection and bone morphogenetic proteins may also used in order to help stimulate bone or other tissue growth.
- many of the embodiments disclosed herein show the constraint device limiting flexion of a spinal segment at the level of or superior to the level of the implant or treatment.
- the constraint device may be applied to the spinal segment so as to limit flexion below the level of the implant or treatment.
- a lower portion of the constraint device may be coupled with the sacrum instead of an inferior spinous process. Sacral attachment methods are disclosed in greater detail in U.S. Provisional Patent Application No.
- the constraint structure may be implanted concurrently with the first prosthesis or procedure, or in a separate procedure performed at another time.
Abstract
Description
Claims (34)
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US20100234890A1 (en) | 2010-09-16 |
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